$-3x^2ym+7x-ymx^2+16x$
$3\cos\left(x\right)^2-1=2\cos\left(x\right)$
$\lim_{x\to0}\left(\frac{e^x\cdot sen\:x-x}{3x^2+x^5}\right)$
$-3x^2+8x-10=30$
$4a+b^2;\:a=2;\:n=-1$
$\frac{2x-3}{5}-\frac{x}{5}$
$\left(5x+\frac{7}{2}y\right)^2$
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